AaronBallman wrote:

> Well, this is not going to make a noticeable difference in runtime. 
> https://reviews.llvm.org/D155548 didn't land because there are no 
> measurements to make where this makes a measurable difference.

Those changes didn't land because no measurements were attempted. Putting up a 
branch at https://llvm-compile-time-tracker.com/ would help get those 
measurements to at least start to see if there's benefit or harm from the 
changes.

> As for my earlier comment, it would also make sense to rename that function 
> to `computeBitWidth()` or just cache the computed value (we compute it when 
> parsing anyway to diagnose 0 size, etc. right?).

Caching the computed value would make sense, but that's sort of the goal of 
D155548, right? That's a generalized caching mechanism that should mean when we 
compute it to diagnose 0 size, we never need to re-compute it again.

https://github.com/llvm/llvm-project/pull/66203
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